A little more than a year ago I purchased new Baer Eradispeed plus rotors for my C5 (black hats). The car is a very fair weather ride, and a show & shine participant.
It is only driven casually. It has never seen a track or other aggressive driving conditions.
At the same time i also installed aftermarket painted wheels and calipers.
Other than Mothers car wash solution I have only used Mother's brake and wheel cleaner, safe for painted wheels, carefully as they instruct on the bottle.
Mothers brake cleaner has been used three times since all parts installed.
I now have a white band on the rotor face, located between its black hat and where the pads make contact. This white band has the appearance like oxidation. Some of it has run down over the black hats as i was rinsing of the Mothers, staining them in white blotches. I dried immediately to no avail. Additionally, rust has formed in small patches in the same areas on two of the rotors. I have not found a solution for saving these as yet. Will probably replace them this winter. Have shared this problem with Baer, not that I am blaming their product! I have asked for their preferred cleaning application for Eradispeeds. Just thought i would share.

 

I have Baer Eradispeed rotors. They were installed back in 2005. No problems similar to your description. Any pics?

 

Will pot some pics shortly

 

Freudian slip?!

 

Fat fingers. Sun going down. Will try and post some pics tomorrow afternoon.

 

I know a little bit about Eradispeed rotors, especially the plus 2. The chemicals you used to clean the wheels. attacked the zinc plating.. this is a discoloration, the cleaning chemicals have removed any zinc that was left on the inside causing rust to form on the inside... then when you wash it or get caught in a rain shower it washes the rust through the drilled holes..
Here is some inspiration for you... these rotors are ten years old, they have 80,000 miles on them... The are the first set of Eradispeed Rotors Baer imported from Australia, their point of origin.
I posted this a few days ago with a shot of them the day I bought them and a shot taken of the same rotors ten years later and with 80,000 miles just a few days ago. BTW these rotors see rain all the time, and occasionally see some salt in the winter.

I detail these four rotors, once a year, it takes about four hours... I do two in one day and then the other two on another day..there is a tech tip on my procedure in the stickies DIY thread


EXIF Info:
Date Taken:2001-07-06 16:05:58
Camera:NIKON E950
Exposure Time:0.0089s (1/112)
Aperture:f/3.1
ISO:80
Focal Length:11.3mm

Here they are taken a few days ago


EXIF Info:
Date Taken:2011-08-30 17:40:03
Camera:Motorola DROIDX
Exposure Time:0.05s (1/20)
Aperture:f/2.8
ISO:396
Focal Length:4.97mm (38mm in 35mm)

 

I ran a set of Baer Eradispeeds (one piece rotors) on my '00 for better than five years. They did not have the black hats - just zinc coated silver ones. Never had that type of problem with them.

Good information by Evil-Twin. If Baer can't suggest a solution, you might try just getting the hats powdercoated or paint them with a caliper paint.

 

This Photo I took the other day, was an attempt to show how well they stand up through the summer.... These rotors are detailed once a year on one of the first nice days in April, every year... when I put the car away, I wipe the wheels with a microfiber towel, and blow off the wheel with my compressor. It takes five minutes tops.

 

Ok, I spent 33 years in Materials Engineering at a major automotive company, and I know a lot about corrosion as my job entailed studying the effects of the environment on our products, and finding low cost solutions to the concerns discovered. I need to know if the "ring" you mentioned is actually silver colored, as shown in ET's picture, or is it truly white. Also, your lack of driving may in fact be part of the problem. Please post some pics so I can give you an expert opinion...this issue has never come up before on the forum and I have a personal interest in solving it. Also, what part of the country do you reside, and are you near any salt water, or salty air as along the ocean coast within 100 feet of the sea.

Jerry

 

Thank you fgor your interest Jerry. I am located several miles inland from the Pudget Sound, in Washington. The brakes have aproximate 3,000 miles on them (installed May 2010). I will post some pics this afternoon.

 

Here are some pics from the noted condition../Users/TLee/Desktop/brakes/forum/IMG_0466.JPG/Users/TLee/Desktop/brakes/forum/IMG_0472.JPG/Users/TLee/Desktop/brakes/forum/IMG_0473.JPG/Users/TLee/Desktop/brakes/forum/IMG_0475.JPG/Users/TLee/Desktop/brakes/forum/IMG_0479.JPG/Users/TLee/Desktop/brakes/forum/IMG_0484.JPG

 

My image in put failed. Will try again

 

Ok, looks like my first thought was correct. You have a number of conditions working against you. First, you ARE in a perfect environment for corrosion to flourish at an accelerated pace.

1) You are downwind from salty air/mist...even several miles inland you cannot escape the strong salty winds coming off the Pacific.

2) You are in a moderate temperature climate which favors the chemical reactions of corrosion on automotive components protected with sacrificial coatings such as zinc plating.

3) You are in a humid/rainy climate which accelerates the reaction between dissimilar metals, in this case, cast iron, zinc, and aluminum. This is galvanic corrosion in which the iron is protected by the zinc which is oxidizing instead of the iron due to the electrical potential differences between the two metals.

For corrosion to occur you need 3 things, and you have them. Water, salt (electrolite), and bare metal(s). The normal color for zinc oxide is bright white in a powder like form...this is why I asked you to show me the color of the rotors. In essence, your car is being subjected to a salt chamber or humidity cabinet the same way parts are tested in the laboratory. The only advice I can give you is to try to eliminate at least one of the 3 things I mentioned above, to break the chain of conditions causing the unsightly appearance...try brushing on a clear coating to separate the 2 metals, and drive the car more often to 'bake off' the water that may be trapped in the interfaces of the hat and rotor sections. Don't let the car sit for very long periods essentially cooking the parts in a humidity chamber like I mentioned above.